Prevents to show Zstandard, Lz4 and Lzma as available options even if ark was compiled with its suppport, but libarchive was not and their commands are not available.
Use QByteArrayLiteral, fix
Nitpick: it's called libarchive, not libArchive ;)
Nitpick: opening brace goes to next line
nitpicks formatting and naming
Feel free to push as soon as you get the answer to https://bugs.kde.org/show_bug.cgi?id=413086#c6
Add missing lz4 check
Clean double lz4 checks